First thing you will need to do is remove all plugs and clean them up. (you can burn off fuel on them with a propane torch, away from the vehicle where you won't start a fire...just heat them up enough to get fuel off...don't cook them) Next, disable ignition system so there is no spark from wires, then spin the engine over with plugs out to clear cylinders, or use a high pressure air hose into each plug hole if available.Since you stated that you have fuel and spark, check that spark is reaching proper destination...Make sure wires are in good condition, cap and rotor as well. Check for carbon tracking in cap and on rotor. If in doubt, change them. Put plugs back in and make sure battery is fully charged before attempting to start engine.You did not mention any history regarding how kit ran before this happened, or if weather is bad where you are. (sometimes important clues) Generally if somehow the engine floded this should get you back to how it was before!

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Related Questions:

The fuel pump pumps the fuel from the fuel tank under pressure up to the fuel rail and injectors.
The coil packs provide a electrical charge (about 40,000 volts) to the spark plugs. It is this charge that makes the spark plug spark.

that is flooding, (lots of causes that)
that throttle hold down is in the operators guide, called WOT unflood mode. it cut fuel 100% it starts via, excess fuel, in engine.
clears then starts and runs.
ever do a full tuneup?
Flooding. (engine good)
bad spark. Cold starts need perfect spark , unlike a hot engine.
so tune up time, for most cars 60,000 miles, some need sparks
every 39k (RTM read the manual in glove box,) it tells you.
as does the FSM state this, and how.
If flooding is not tune up related, then it is>
1: leaking injectors.
2: too high fuel pressure.
3: bad inputs to the PCM (like ECT reads too low temp) scan IT.
4: ISC stuck closed ,staring, the engine of air as start.
to test this #4 theory, (told in newer car operators guides) is to
start car with 10% throttle , start now? that may prove ISC stuck closed.

ever examine spark plugs, they speak volumn's.
these are new plugs, and are soaking in raw fuel.
on old plugs. its hopeless. (even weaker spark)
we use tools to find cause, got tools?

The valve cover gasket change is related only to the extent of needeing to remove something else . There is the fuel pressure regulator and the MAF SENSOR talks to the ECU telling the computer how much fuel is needed for proper mixture of thre air passing into the intake. It is the first sensor in the intake duct coming out of the sir filter. Make sure all the injectors are secure in wiring connection and look around for any other that had to be removed. All plugs mean it isn't just one injector. Unplug and replug the MAF. cHECK THE THROTTLE POSITIO SENSOT. iT RIGHT THERE where the fuel likage is attached.

does it get fuel ???? try to start loosen fuel rail to see if it leaks fuel pressure if you dont have tools... hows that distributor and rotor???
the coil get a voltmeter check for volts on starter solenoid ...also the coil ( when trying to start.)

ya these motors need tons of fuel pressure so if you have a pressure tester test the fuel pressure prior to the fuel filter and see if it is atleast 25 psi if not replace pump with new or rebuild all the luck to you with current project